211222121212 has 24 divisors (see below), whose sum is σ = 392729783040. Its totient is φ = 99117509040.

The previous prime is 211222121189. The next prime is 211222121219. The reversal of 211222121212 is 212121222112.

211222121212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×211222121212² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 211222121212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211222121219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12978964 + ... + 12995227.

It is an arithmetic number, because the mean of its divisors is an integer number (16363740960).

Almost surely, 2^211222121212 is an apocalyptic number.

It is an amenable number.

211222121212 is a deficient number, since it is larger than the sum of its proper divisors (181507661828).

211222121212 is a wasteful number, since it uses less digits than its factorization.

211222121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25974321 (or 25974319 counting only the distinct ones).

The product of its digits is 128, while the sum is 19.

Adding to 211222121212 its reverse (212121222112), we get a palindrome (423343343324).

The spelling of 211222121212 in words is "two hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twelve".